VI Edna Pontellier could not have told why, wishing to go to the beach with Robert, she should in the first place have declined, and in the second place have followed in obedience to one of the two contradictory impulses which impelled her.
He saw enough in her face to impel him to take her hand and hold it while he said his lingering good night.
A quick impulse that was somewhat spasmodic impelled her fingers to close in a sort of clutch upon his hand.
There are no more uses of "impel" in the book.
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When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another ... that they should declare the causes which impel them to the separation.
Thomas Jefferson -- The Declaration of Independence
The only explanation which I could think of for this mass exodus was that I had somehow disturbed the wolves so seriously they had felt impelled to abandon their den.